Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

52°
H 68°
L 53°
NNW
3mph
Low tide
8:43 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Tuesday, September 15, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 45m at 8:43 am (0.6 ft)
Next high tide : 3:01 pm (8.4 ft)
Sunset today : 6:53 pm
Sunrise tomorrow : 6:22 am
Moon phase : Waxing Crescent (21% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Jan 1907

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue12:207.412:188.46:000.96:35-0.17:144:18Full Moon1Tue
2Wed12:567.412:548.36:370.97:100.07:144:18Waning Gibbous2Wed
3Thu1:317.41:308.37:140.97:470.07:144:19Waning Gibbous3Thu
4Fri2:087.42:108.17:550.98:270.17:144:20Waning Gibbous4Fri
5Sat2:487.52:558.08:410.99:110.17:144:21Waning Gibbous5Sat
6Sun3:337.63:457.89:310.89:580.27:144:22Third Quarter6Sun
7Mon4:227.84:407.710:250.710:490.37:144:23Third Quarter7Mon
8Tue5:148.05:407.611:240.511:450.37:144:24Third Quarter8Tue
9Wed6:108.36:447.612:260.27:144:25Waning Crescent9Wed
10Thu7:108.77:507.812:440.21:31-0.27:144:26Waning Crescent10Thu
11Fri8:099.18:528.01:450.12:32-0.77:134:27Waning Crescent11Fri
12Sat9:079.59:508.32:44-0.23:30-1.17:134:29New Moon12Sat
13Sun10:039.810:468.53:40-0.44:25-1.57:134:30New Moon13Sun
14Mon10:5810.011:408.74:35-0.65:19-1.67:124:31New Moon14Mon
15Tue11:5210.05:30-0.76:11-1.67:124:32New Moon15Tue
16Wed12:338.712:459.86:23-0.67:02-1.47:114:33Waxing Crescent16Wed
17Thu1:248.71:379.47:17-0.57:53-1.17:114:34Waxing Crescent17Thu
18Fri2:168.52:318.98:11-0.28:45-0.67:104:36Waxing Crescent18Fri
19Sat3:098.33:278.39:080.19:38-0.27:104:37First Quarter19Sat
20Sun4:048.14:257.810:070.410:310.37:094:38First Quarter20Sun
21Mon4:587.95:247.311:070.711:260.87:084:39First Quarter21Mon
22Tue5:537.76:257.012:090.87:084:41First Quarter22Tue
23Wed6:497.67:266.812:231.11:110.87:074:42Waxing Gibbous23Wed
24Thu7:447.78:226.91:211.22:090.77:064:43Waxing Gibbous24Thu
25Fri8:357.89:137.02:141.22:590.57:054:44Waxing Gibbous25Fri
26Sat9:218.09:587.13:021.13:440.37:054:46Waxing Gibbous26Sat
27Sun10:038.110:397.33:441.04:240.17:044:47Full Moon27Sun
28Mon10:438.311:187.44:240.85:010.07:034:48Full Moon28Mon
29Tue11:218.411:557.55:010.75:36-0.27:024:50Full Moon29Tue
30Wed11:578.55:370.66:10-0.37:014:51Full Moon30Wed
31Thu12:297.712:328.56:140.46:44-0.37:004:52Waning Gibbous31Thu
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8423745)

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Common Questions About Portsmouth, NH Tides

Collapse All
Is this week a spring tide or neap tide in Portsmouth, NH?

Portsmouth, NH is currently in a transitional phase. Tonight's moon is 21% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are shifting between spring and neap.

What datum are Portsmouth, NH tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Portsmouth, NH?

Tide predictions for Portsmouth, NH come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Portsmouth, NH?

Tide data for Portsmouth, NH is sourced from NOAA Station #8423745. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8423745.

What is the moon phase in Portsmouth, NH tonight?

Tonight the moon over Portsmouth, NH is Waxing Crescent (21% illuminated). This places Portsmouth, NH in a transitional tide cycle, so tidal ranges are shifting between spring and neap this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA

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